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CVE-2026-33678

28
FAUCET Score

CVE-2026-33678 is a high-severity vulnerability (CVSS 8.1) in Vikunja, an open-source task management platform, affecting versions prior to 2.2.1. This flaw allows any authenticated user to bypass authorization checks and download or delete any attachment in the system by providing a valid attachment ID, due to `TaskAttachment.ReadOne()` incorrectly querying attachments. The vulnerability has high confidentiality and integrity impacts, with low attack complexity and trivial enumeration of sequential attachment IDs. There is no evidence of active exploitation, nor are public exploit tools available, though it has received minor community discussion.

Impacted Technologies

VendorProductVersion(s)CPE
< 2.2.1CPE matchmatch criteria
cpe:2.3:a:vikunja:vikunja:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.1HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
5.2
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.27%
Probability of exploitation in next 30 days
EPSS Percentile
18.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0027 is in the 6th percentile among its peer group of 17,829 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

gopatch availablevia ghsa
Product: code.vikunja.io/apiFixed in: 2.2.1
github_advisoryvendor investigatingvia nvd_reference
View patch

Vendor Advisories (1)

goGHSA-jfmm-mjcp-8wq2high

Vikjuna: IDOR in Task Attachment ReadOne Allows Cross-Project File Access and Deletion

Mar 25, 2026

References

github.com / go-vikunja/vikunja/security/advisories/GHSA-jfmm-mjcp-8wq2
ExploitVendor Advisory
vikunja.io / changelog/vikunja-v2.2.2-was-released
Release Notes